KYMCO AK 550, Service Manual

Page: 102 / 461

3.External Components
AK 550
O2 Sensor Removal
Remove the O
2
sensor with a 17 mm wrench. Use care not to pinch the wires.
Installation torque: 2~3 kgf-m (20~30 N-m)
Apply anti-seize compound to the threads of the O
2
sensor. Install the O
2
sensor
and tighten it to specification with a 17 mm wrench. Use care not to pinch the
wires.
The O
2
sensor issues signal to ECU when the temperature is over 350°C while
the engine is running.
Test the O
2
sensor at room temperature.
Use a digital multimeter set to ohms of resistance to inspect the O
2
sensor.
Measure the resistance between the white wire terminals of the O
2
sensor
connector. Replace the O
2
sensor if the reading is out of specification.
ITEM SPECIFICATIONS
O
2
heater sensor resistance (at 20°C/68°F) 12 - 18 Ω (engine warming condition)
3-25